[fine] Support assignment to member, loops with iterators

Hmm it's starting to look like something.

fine/tests/expression/class.fine

@@ -42,7 +42,7 @@ fun test() -> f64 {
 // |     0: LoadArgument(1)
 // |     1: LoadArgument(0)
 // |     2: PushString(0)
-// |     3: PushInt(37)
+// |     3: PushInt(33)
 // |     4: NewObject(2)
 // |     5: Return
 // | function Line (4 args, 0 locals):
@@ -52,7 +52,7 @@ fun test() -> f64 {
 // |     0: LoadArgument(1)
 // |     1: LoadArgument(0)
 // |     2: PushString(0)
-// |     3: PushInt(44)
+// |     3: PushInt(40)
 // |     4: NewObject(2)
 // |     5: Return
 // | function test (0 args, 3 locals):

fine/tests/expression/errors/wild_member_access.fine

@@ -7,15 +7,6 @@ fun test() {
   let z = f.{let y = 222; foo };
 }
 
-// NOTE: The AST allows for generic expressions to the right of the dot.
-//       We need to make sure things are parsed correctly.
-//
-// TODO: Better parser recovery will improve the specifics of the errors.
-//
-// TODO: This is parsed wrong; the `{` is consumed after the '.' and it
-// should instead be ignored. This is the "greedy" expression parsing that
-// matklad talks about in his resilient parser article.
-//
 // @expect-errors:
-// | 7:12: Error at '{': expect ';' to end a let statement
+// | 7:12: Error at '{': expected an identifier after a '.' in member access
 // | 7:26: cannot find value foo here

fine/tests/expression/loops.fine

@@ -1,3 +1,21 @@
+class Finished {}
+let FINISHED = new Finished {};
+
+class Iterator {
+  current: f64;
+
+  fun next(self) -> f64 or Finished {
+    if self.current < 10 {
+      let result = self.current;
+      self.current = self.current + 1;
+      return result;
+    }
+
+    FINISHED
+  }
+}
+
+
 fun test() -> f64 {
   let result = 1;
   let i = 0;
@@ -5,8 +23,15 @@ fun test() -> f64 {
     result = result * 2;
     i = i + 1;
   }
-  result
+
+  let sum = 0;
+  let it = new Iterator { current: 0 };
+  while it.next() is v: f64 {
+    sum = sum + v;
+  }
+
+  result + sum
 }
 
 // @no-errors
-// @eval: Float(1024.0)
+// @eval: Float(1069.0)